The hill fort was designated as a scheduled monument (number 27556) in 1934. The site is now managed by English Heritage. The accessible hill fort gives panoramic views across North and Mid Wales, Cheshire and Shropshire.

The complexity of defences suggests there have been several phases of development. In the earliest period, a few round huts were sited on the undefended hillock. Subsequently these were enclosed by a double bank and ditch that enclosed 5.3 ha (13 acres). Entrances were placed at the east and west ends of the earthworks where the inner bank was pulled inwards to create large gateways. Later a third bank was added on all sides except the south east where the hill's steep incline made it unnecessary.

The western entrance was re-modeled with unusual rectangular hollows separated by ridges dug out and defended by outworks. The eastern entrance was also strengthened with two further external circuits of banks and ditches.[1] Despite the size of its fortifications, there is no evidence that the Roman Legions attacked Old Oswestry during their conquest of the region in the 50CEs.[1]

During the First World War, the Canadian Expeditionary Force stationed at nearby Park Hall camp used the earthworks for training purposes. Many large pits, trenches and craters from explosives irreparably damaged the interior site during these military activities.[1] The war poet Wilfred Owen, who was born in Oswestry, completed his army training at the hill fort

In 1939, Yorkshire geologist and amateur archaeologist William J Varley conducted the most extensive examination of the site.[4] His work, which was not published until the 1990s, remains the most authoritative work on the site. His excavations showed that the complex defensive ramparts that surround the hill fort were not built at the same time and that there were four distinct phases in their development.

Since 2015, housing developers have been trying to get planning permission for new homes near the slopes of the ancient monument. However, an ongoing campaign (backed by local residents and archaeologists) has stalled these proposals.[5]